minor fix in a makefile of the VAD example
Fix bug in check slot allocation function.
minor modification in XML ex8 example Makefile
Changes to support configuration of policy (with "policy "attribute instead of "value"), to support configuration of scheduler triggering, and configuration of enabling of time slicing
add 1st bunch of basic real time examples for the XML front-end
support of specification of priority, period and deadlines in the XML front-end
support of cycle executive policy specification from XML front-end
fixes for aplying common static schedulability checks only for periodic sets, and to report the scheduler a check refers to
some clarifications on explanations of brt_1 example
some aditions to the manual